NCERT Revision Notes for Class 3 Maths Chapter 6: House of Hundreds – I – Free PDF Download

Chapter 6 of Class 3 Maths, House of Hundreds – I, introduces numbers up to 1000, extending place value understanding to include the hundreds place clearly, along with reading, writing, and comparing three-digit numbers confidently.

Last Updated: September 23, 2026

Key Concepts

Place value up to hundreds: every three-digit number is made up of hundreds, tens, and ones, such as 456 having 4 hundreds, 5 tens, and 6 ones.

Building numbers with blocks: using hundred blocks, ten rods, and one units to physically represent three-digit numbers.

Reading and writing numbers up to 1000: matching numerals with their word names, such as 999 as “nine hundred ninety-nine”.

Comparing three-digit numbers: comparing the hundreds digit first, then tens, then ones, to decide which number is greater.

Number line up to 1000: placing and locating three-digit numbers on a number line to build a sense of their size and order.

Worked Examples

Example 1

How many hundreds, tens, and ones are in 356? 3 hundreds, 5 tens, and 6 ones.

Example 2

Write the number name for 480. Four hundred eighty.

Example 3

Compare 512 and 521. Both have 5 hundreds, but 521 has 2 tens compared to 512’s 1 ten, so 521 is greater.

Quick Recap

• A three-digit number is made up of hundreds, tens, and ones.
• Place value blocks help build a physical understanding of larger numbers.
• Reading and writing numbers up to 1000 uses the same pattern as smaller numbers, with “hundred” added.
• Comparing numbers always starts with the highest place value first.
• A number line can help visualise the order and size of numbers up to 1000.

Common Mistakes to Avoid

• Forgetting to include the hundreds place while reading or writing a three-digit number.
• Comparing numbers by looking at the ones digit before checking the hundreds and tens digits.
• Mixing up the number of hundred blocks, ten rods, and one units while building a number.
• Writing an incorrect number name for numbers with a zero in the tens or ones place, like 305.
• Placing a number in the wrong position on a number line due to miscounting the intervals.

Home Practice Tips

• Use household items, like bundles of 100 straws, 10 straws, and single straws, to build three-digit numbers.
• Practise writing a few three-digit numbers daily in numeral and word form.
• Play a comparing game with three-digit number cards.
• Draw a simple number line and practise placing numbers up to 1000 on it.
• Look for three-digit numbers in real life, like page numbers or prices, and read them aloud together.

Frequently Asked Questions

Q1. Why is understanding the hundreds place important in Class 3?
Clearly understanding hundreds, along with tens and ones, is essential for accurately reading, comparing, and later adding and subtracting three-digit numbers.

Q2. How can place value blocks help with this chapter?
They give a hands-on, visual way to see what a number like 356 actually represents, making abstract place value concepts more concrete.

Q3. How do I compare two three-digit numbers correctly?
Compare the hundreds digit first; if they are equal, compare the tens digit next, and if those are also equal, compare the ones digit.

Q4. What is a common mistake with numbers that have a zero in them, like 305?
Children sometimes skip the tens word entirely or misplace it, so practising these “zero in the middle” numbers specifically helps build confidence.

Q5. How does this chapter prepare for later topics?
Solid place value understanding here directly supports addition, subtraction, and further number topics involving three-digit and larger numbers.

Full walkthrough: Chapter 6 Solutions for step-by-step textbook answers.

Written by Satish

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